Drive assembly suitable for use in a drug delivery device and drug delivery device

Active Publication Date: 2012-01-12
SANOFI AVENTIS DEUTSCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0050]According to at least one aspect the piston rod engages the housing. The piston rod may threadedly engage the housing. Rotational movement of the piston rod around the axis and/or translational movement of the piston rod along the axis may be facilitated therewith.
[0051]A pitch of a thread for a threaded engagement

Problems solved by technology

Thus, this device is not intended for prov

Method used

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  • Drive assembly suitable for use in a drug delivery device and drug delivery device
  • Drive assembly suitable for use in a drug delivery device and drug delivery device
  • Drive assembly suitable for use in a drug delivery device and drug delivery device

Examples

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Example

[0134]FIG. 1 shows an oblique sectional view of a first embodiment of a drive assembly. FIG. 1A shows a sectional view of the first embodiment of the drive assembly.

[0135]The drive assembly 1 according to FIGS. 1 and 1A comprises a housing 2. The housing has a proximal end 3 and a distal end 4. An axis A extends between the proximal end 3 and the distal end 4. The drive assembly 1 comprises an indicator 5. Additionally, the drive assembly 1 has a piston rod 6. Indicator 5 and piston rod 6 are located within the housing 2. Furthermore, indicator 5 and piston rod 6 are arranged on the axis. Thus, axis A can run through piston rod 6 and indicator 5. The housing 2 may have a tubular shape. The rotation member 7 can be formed shaft-like.

[0136]The drive assembly 1 comprises a rotation member 7. Rotation member 7 is arranged within the housing 2. A main (longitudinal) direction of extent of piston rod 6 and / or rotation member 7 is aligned along the axis A. Rotation member 7 and indicator 5...

Example

[0164]FIG. 2 shows an oblique sectional view of a second embodiment of the drive assembly 1. FIG. 2A shows the second embodiment with the piston rod being moved distally away from the proximal end into a first position. FIG. 2B shows the second embodiment with the piston rod being moved distally to a second position away from the first position and away from the proximal end. This embodiment essentially corresponds to the embodiment described in connection with FIGS. 1 and 1A.

[0165]In contrast to the latter embodiment, indicator 5 and piston rod 6 are coupled to one another with the coupling being configured for rotational movement of the indicator being decoupled from movement along the axis of the piston rod for a given range of movement of the piston rod 6 along the axis A. The rotation member 7 is also arranged within piston rod 6 in that range of movement.

[0166]For this purpose, indentation 17 comprises a region 19 that runs parallel to axis A. Therefore, while the protrusion 1...

Example

[0171]FIG. 3 shows an oblique sectional view of a third embodiment of the drive assembly 1. The third embodiment essentially corresponds to the embodiment described in conjunction with FIGS. 1 and 1A.

[0172]In contrast thereto, the drive assembly 1 according to the third embodiment comprises a plurality of indication surfaces, which are arranged side by side along the axis A. For example, indicator 5 comprises two indication surfaces 13 and 22. Each of those indication surfaces can be provided with a plurality of index elements 14. Indication surfaces 13 and 22 may be non-rotatable relative to one another.

[0173]In this embodiment, the indicator 5, in particular indicator part 12 thereof, which comprises indication surfaces 13 and 22, is threadedly coupled to the housing 2. Preferably, indicator 5 is threadedly engaged to the housing 2. Housing 2 can comprise a (helical) thread 23 that engages a (helical) thread 24 of indicator part 12.

[0174]If the indicator 5 rotates, the indication ...

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Abstract

A drive assembly for use in a drug delivery device is proposed, the drive assembly comprising: a housing having a proximal end and a distal end; an axis extending between the proximal end and the distal end; at least one drive member; a piston rod adapted to be driven along the axis by the drive member; an indicator adapted to provide positional information about a position of the piston rod relative to the proximal end, wherein the indicator and the piston rod are configured to convert a movement of the piston rod with respect to the housing into a rotational movement of the indicator. Additionally, a drug delivery device comprising the drive assembly is provided for.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to International Application No. PCT / EP2009 / 003310 filed on May 9, 2009, which claims the priority of European patent applications EP 08009260.4, filed on May 20, 2008, and EP 08011676.7 filed on Jun. 27, 2008. The entire disclosure content of these applications is herewith incorporated by reference into the present application.TECHNICAL FIELD[0002]The present invention relates to a drive assembly suitable for use in a drug delivery device, preferably a pen-type injector, by which a number of pre-set doses of a medicinal product can be administered. In particular, the present invention relates to such a drug delivery device where a user may activate the drug delivery device.PRIOR ART[0003]Such drug delivery devices have application where persons without formal medical training, i.e., patients, need to administer an accurate and predefined dose of a medicinal product, such as heparin or insulin. In p...

Claims

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Application Information

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IPC IPC(8): A61M5/315
CPCA61M5/31541A61M5/31555A61M5/31593A61M5/31551A61M2005/3126A61M2005/3152A61M2005/3125
Inventor JONES, MATTHEW MEREDITHPLUMPTRE, DAVID AUBREY
Owner SANOFI AVENTIS DEUTSCHLAND GMBH
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